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A024303 Expansion of tan(tanh(x)).x/2. +0
1
0, 1, 0, -24, 448, -640, -658944, 56992768, -2831024128, -86998155264, 51519425740800, -9075812362878976, 917148920337924096, 26667007293767286784, -33058738844745936666624 (list; graph; listen)
OFFSET

0,4

MATHEMATICA

Tan[ Tanh[ x ] ]*x/2 (* Even Part *)

CROSSREFS

A009718.

Sequence in context: A083195 A004358 A006260 this_sequence A060195 A114201 A052715

Adjacent sequences: A024300 A024301 A024302 this_sequence A024304 A024305 A024306

KEYWORD

sign

AUTHOR

R. H. Hardin (rhhardin(AT)att.net)

EXTENSIONS

Extended with signs 03/97.

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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